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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c850596de8e4ee64ae5dcfc9dfa2f6f2c865a80255d719e87e3bef322f8c4d' 
  AND token = 'p+scrjbZBurMcKm8Xggrn1fpzLkutE1ZLf3PFDea+2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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