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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111b23f2aa7326371eb236f7dcbcc4be6adf7dd79542607f6ca876c5d0bc894f' 
  AND token = '0OWzJYV+ManK99pJRkR7BDkw2e8vef8xZavJCKyJr7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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