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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca47b23fb53a3045a622e4cc2e70e387e48d75711976d9e154d5d665984d5a62' 
  AND token = 'edN89Pbyn2QjvZ97vWC3hBzGPUlqk4Bz3aQE9hsZJUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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