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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34db75a5d30ff11891232eeb4a5fe37f1673733055277613502216f40afe33c' 
  AND token = 'i8vJ4Yel0PgEVN7jiUCW6pgWOAELX8fSaNMwMoo3X9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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