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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbbc33d6857a6c1eeed15080fd7b4242fa94db2f141b086ba81e4d7f32caa7a' 
  AND token = 'aZKM5oAL3ie8RT44O83ojGgP7VLTYFejiA5CRXMCz+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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