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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fbc5cc1dcf99f020286e9c5ce7cab92e638780b2dd4d3c1c52b906144f91ca' 
  AND token = 'Q2KgXCwKL1UuP5Xpwvk6pn/XIUjrL9SpN8eB5ihMays=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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