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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69aab114a2663f8f11f20e04d925435cf22978c5d1a2f4d1f2637e05020384d7' 
  AND token = '1sreG4fjoORXro/2w1yFPRywoCcPqESRrBxrtqPYkv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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