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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9cc93f901839f5f452ba7f24cc3f35208f86d9778075746e89b46e5dee52a9' 
  AND token = 'K4NpsmID4BikQgdpkxNhTBJEovcw8Iw7KtQ7Z70P3WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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