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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108c1226a961e28bad731df29763daac36f94e060a109988503902c63a0cca9c' 
  AND token = 'CiLHs/evRkzLZ6y+PjBKiuPJM4Dr5R7yHfvaRqdSw/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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