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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6170b6cf4b346924baffa7831cf468773249481dc515032d121df7a3499fdf5a' 
  AND token = 'FqTtwG1lJ7QQRdjSa9egPPP4iFOackxu2EvW5/i/I/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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