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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6434b785e6e958ce0794ad26538c9761afbee89089c4cce79bbf6834bf277703' 
  AND token = 'fo1bVOR9f27Kwo6PoqiT/mJ2XNAyOgswjtqA8ryfSXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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