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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446d1973a03d89fe8557fd7e72d0ecf6b690c87f8482ca0fb107ba9dc77e8904' 
  AND token = 'v+4hgTckmkzQ99ndwnRSeZ6Pnn13mcWkT9UVqISU/Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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