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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571ae7b64445068afe50badbe546c829da0385665a9434a0bedc0bb7b2cb6ede' 
  AND token = 'cvGU/7bM56sD6SOTjzP3+Q8okae2CkZmVd9pQh1Hn8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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