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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738fa9e0b870163f8213aab3a6482b63ddc16728640ca09e878856817e2c084f' 
  AND token = '9XzOQf5Vx/P0ZR3wLlz6aqdLmMDeJg5qKQsZFiA6zJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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