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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89239da91611365c29e193fb734e606abb2499dd1c801d30e033796e2e4b8c4' 
  AND token = 'uSAwquv78uPu6EvOI+fqYghsir8C9CT6OSWodegc4ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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