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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cbebf2a9a5cd5d3c2b4b0ede4bf74dd5ba41b11303e2fd1ee5768c8cf0ec6a' 
  AND token = '8kRZxXckhsYtjfQPfKsjq0wGeFiQPh4G+cRsfNg1vKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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