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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb8ec16f1129ecef13b35b8f067de7284e31738c7dcf49f81869cf875225005' 
  AND token = '8jG7a6SBz7i07IzTLRfB9iKYLicB8q4dMlqiJmHkVZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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