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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c84c3ca17fa2ff2ce63744cf977f8e74436a369a3489be49dd0771a9c313cf' 
  AND token = '4h29Gmp8JwnesrbMtso8mDNG5CZrJLREv0tJjQARULY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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