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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77ccb0b7c70137d1e81de3bcabc173b7fd57776c576935bbd4f5e479315d469' 
  AND token = 'vNYQPL9N7kt8pMdL1dA7vRp6GHJmCsO+RghJexJT1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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