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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6ccf39924ae767e08068e9599ede0e77355de3cf09d1164e76d2def5048d8e' 
  AND token = '7rOU2aWZ6DrYyBKKXdcPHyspo0EJg3RpkEFmQStNLlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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