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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5270bb8fb1c170ba7c5d1c7cf837b1634a833688993d41746000c81663e0c2' 
  AND token = 'ikuW+BIGo3VtcrXUru2b2PS+WQBy+ZOrlr5J8ICl77Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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