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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df52d9e7a6b65827f08eaa00034ab2b8963ee00547fd6fd1797e9f0012c8f15' 
  AND token = 'GKA0jQWZN+P2h/a3aCmHn4/zZysXUkkx/hk7rGvkPGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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