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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abf075f951bf800b5ddcdb4a8777f4737be5cbf565e44cb3904b19e18602515' 
  AND token = 'rRG1s5wIZJHhiix8kzFL3OI7cXdKmaAHB0zKzh/6c20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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