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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38aed794605fde7097def5ba9dfdf2e8052a4be8729d3b7a88c170c62112fde3' 
  AND token = '4NkyMDFYRgFJDwdXGwyZsw0XsfcYAyHqmDkojgvUs9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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