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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adf8a8d38d94ff47e5f905e1a7d24be6a23f3b337aa2677d99077b629bae275' 
  AND token = 'oYc6ZSYVnUL2Kp3qFuy2EaVxUUIqXkuXSzE6hqwIeeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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