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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea313c5236ede112249e4dc0861e38c5879b9dec38a427bf529d27a4a1ca78c6' 
  AND token = 'wdnRDvVPiOvHVr5xmSc9IHi2g66YuAPWRlsu+7+y0xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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