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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73b57068b8eb32b3a11c4054062ab3b28a86ad4f0d848fe143627e713dbb43a' 
  AND token = 'nSaLWB9mtGq8YQViwVr5ZnEs5a8AH3FA/+s6u6RSLic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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