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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a75653bf5f6853cddfab26045b556cc3506f8a550e80261e3930f3e494bc0de' 
  AND token = '6R9pkEMQL6zxcAZRUKMVKXY24CBVT8OnuritpEfdw6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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