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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edde682d677cb8f39dc940e602d5b2e72d83d8e2a9d57f0b94dc5a76e0fc5afb' 
  AND token = 'oxWeLuB6aV9GNj7Bld2afewXMUKU21ARY7RW4/KQPJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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