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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610d7088b14985c1de244115d1aa2da0a066e4b3324c6b65587a2f00ee57b05c' 
  AND token = 'bbnhnLLVrjERWD3iNYuAmlFdYSAwxsvO8MJVcN1uPE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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