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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbfc70d4798158d85937fc77e63e67fe047fdea7968644982bb24a17bfb7478' 
  AND token = 'rj5tbQ59ixrTKyOxawNovtqOq+S+TBs0gPO15T3BEhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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