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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e438f427354d380dd88d470a7ca66d6cf4daf8505717dd6be5a16f29c582bb' 
  AND token = 'IF3dn22TwLvf8j/LKhOLSwgGsNT+4AkmAxvke47pq80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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