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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bcf10b22c1dfde6054a490c36c581ace969b385178d1ab4bab4fc7095c67dc' 
  AND token = 'QGvEv6/rtLlsT/31ABGp9bS2gNhFT3ukhaAVF0OlL5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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