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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efd36add8dc5191a8bf2c781b22ebf3f4c735c7544cf8aa1d8a10bdb7e2a27c' 
  AND token = 'hJ5AhVy1HYX1w9mAcGoKx/HL1ITLa9i30g1bQmhxqk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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