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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bdb0c565e5e4fe156b0e9c1553c57a8f49a80ad20fc060c24029fe6f263a9e' 
  AND token = 'xzsynI5uCHAv/dTxt2HM0WioNVunUuQa+FT0vnHQU1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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