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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98bf111cb7a05a5bd11132ffc9d8b4e5603bf766dc9b5dd9f8e7c1eba5e1d90' 
  AND token = 'CeNJbTew7K87OBP1hF8meqA888mSHHlbyMJIv5WCzDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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