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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae6a5077e3120d24da380e3c476199b53c0e4c18f74c7e71bcb6e8ebe213078' 
  AND token = 'LAdY+Nj1EfkfrEGVBVq94boCY9Vyt9Vp+U/jcZtPC6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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