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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f97cd955c1dd809bbac2929fd06750b2e8c73fee4cba48ca01342febf02e17' 
  AND token = '/W+dESuweKiEHfBGil3mdmIdo8AgKnl8y3OlSitNDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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