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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4a427e5f11721fadd5587262b76a9cc781390101d6f69f3131a9dd84f3ae04' 
  AND token = 'ztDFqCOxKxtv5kVfCiRe8mspIiynawTZHc09UzUnXdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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