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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c340a7823a817a61ff94e8c33933a46209f0be8aafe597e646d4d3ea96e441cf' 
  AND token = 'Dc9GyLJjLVy3i54xZZX8oaQhwaZQ2IU+uMlBcA2H98o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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