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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f65977d515e91a081d8a931b72ebd523971918bb5854174d218282fe10d10a' 
  AND token = 'W9a8JvcD/Mdp0doqwYVp9FWGYDq/b8g+vmWwKIfL574=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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