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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba0c48352b38e2a90b09140d9f68f12b1c962cbe783b72751ab72f686317355' 
  AND token = '9TjSVNAd7KUmXI5hs67T/JGhd5vSiEX01rMkR6mE4Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}