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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff702f7b5998729f2d5897d6b0af304b8b8faba12d6d2e3933f0e88c82035121' 
  AND token = 'WnO6hsnKr1yKjnM4uoLk/UySIhcCXQeiVzAq6qzA8bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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