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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ece657f1e9dab55e70abc50d4ac17058728293d9270355344b4c5ad90bd0704' 
  AND token = '20OziuY3BAlC00yU6Jd0mz6i0r04GwafYFNZBKTBMLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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