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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1217554ac386aff1cf1763959dfa77704858f604a44b6edc938ce8ab855a21c' 
  AND token = 'nX2pKqqdUkb+DI1ewWQOzdn4O0bLlgEGTTl9+RuimLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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