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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b90e50963181aa3e266007a3aab92ace60ab960e2e192457023359694576be' 
  AND token = 'OImwg4huGtjRskzdDJerHlIvFxirxI3YEgj7Uzx3H+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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