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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076fbb07da75723ca4e0c26087ea6ebcae7675a4b810fbbfdfd06e170a7442a9' 
  AND token = 'LxB5BlfK1U5jpRa7+v5O+2NrDBnAr2HEom/odp4gK0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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