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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840a42630b7109d2270e3e3b557a6b4ab23b5844753f647190839e0d08d929ed' 
  AND token = 'Q6HfPnDZsqXa/dKHv8o+5KkYol1aCqkUCF69iRsMBeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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