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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059cb1ac3aa6e3c90154300bd8a990908147265a0351f4611f6d0eddbe312bc5' 
  AND token = 'BH8eq7flnPXPhWrEQaUBfdiyPZxsz3RTvC9lA+YdIqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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