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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a150cb451854e829772f116e62d6bde3f2ed484c104c59510b10dc4af9bca74' 
  AND token = 'oEoHBylUGjTVL9pQ2HHCiFsJejbwoPaKSArKoD68CbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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