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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a0a021cee65affd62842176734e9f4a39c6f7743ce5836a92a09edafae8d14' 
  AND token = 'qmedmlY5ZT9/YczgWBnltezKUIx38Z3B3qiavsjsAmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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